Howdy. There can be numerous reasons for crashes. The first things to do are update system drivers, verify the game cache, or reinstall the game. After that, toggle off graphic settings and see if that allows you to proceed. If none of these works, let me know.

WHY DON'T YOU FIX THIS STUPID BUG WHICH HAS BEEN A KNOWN BUG ON ALL LINUX MACHINES WITH A LOCALIZED LANGUAGE SETTING SINCE 2 YEARS (AT LEAST) ????

The only thing you have to do is to rename all files in the cutscenes folder from uppercase filenames to lowercase filenames. I have done that on my system as suggested by the previous poster and now everything is fine (if not double-fine). Why aren't you able to do such a minor, simple, little bugfix and upload it into the steam cloud???